Heat exchanger

ABSTRACT

A multipass type heat exchanger comprising a plurality of composite cylindrical shells concentrically arranged and spaced apart one from the other and welded together by means of spacers. Each composite cylindrical shell is composed of a pair of trough shaped elements. Each element consists of two segments made integral into one body and one of these segments has a number of longitudinal ribs spaced apart one from the other and extending in a lengthwise direction throughout the total length of the segment and another segment has a number of peripheral ribs spaced apart one from the other and extending in a peripheral direction throughout total periphery of the segment. The latter segments surrounds the former segment to form a number of first elongate passages for hot or cold medium which is fed from a top opening of said composite cylindrical shells and flows downward to a base opening. The composite cylindrical shells are closed at their substantially upper and lower portions to form a plurality of second elongate passages for fluid to be heated or cooled which is fed from a lower side opening of said composite cylindrical shells and flows upward to an upper diametrically opposite side opening.

United States Patent 1191 T akayasu 11 1 3,828,851 1451 Aug. 13, 1974 1 HEAT EXCHANGER [76] Inventor: Kiyosumi Takayasu, No. 2 S-chome,

Horita, Mizuho-ku, Nagoya, Japan [22] Filed: May 31, 1973 [21] Appl. No.: 365,598

[30] Foreign Application Priority Data Primary ExaminerCharles Sukalo Attorney, Agent, or Firm-Silverman & Cass ABSTRACT A multipass type heat exchanger comprising a plurality of composite cylindrical shells concentrically arranged and spaced apart one from the other and welded together by means of spacers. Each composite cylindrical shell is composed of a pair of trough shaped elements. Each element consists of two segments made integral into one body and one of these segments has a number of longitudinal ribs spaced apart one from the other and extending in a lengthwise direction throughout the total length of the segment and another segment has a number of peripheral ribs spaced apart one from the other and extending in a peripheral direction throughout total periphery of the segment. The latter segments surrounds the former segment to form a number of first elongate passages for hot or cold medium which is fed from a top opening of said composite cylindrical shells and flows downward to a base opening. The composite cylindrical shells are closed at their substantially upper and lower portions to form a plurality of second elongate passages for fluid to be heated or cooled which is fed from a lower side opening of said composite cylindrical shells and flows upward to an upper diametrically opposite side opening.

1 Claim, 8 Drawing Figures PATENIEUAUBHIBH 3,32 51 sum 1 or 6 v F/GJ v PATENTED I 3.828.851

suwanFs -3 luh n mull PATENTED mm 3mm sum {BF 6 PATENIEDAHWIBH 8 8.828.851

SHEET 6 DFG HEAT EXCHANGER This invention relates to a heat exchanger for effectively heating or cooling a fluid to be treated such as various kinds of electrolytes or liquids to be chemically treated.

'Heretofore, it has been proposed to use a multipass heat exchanger comprising a plurality of longitudinal passages constructed by superposing a plurality of metal sheets one upon the other with a spaced relation for the purpose of heating or cooling an electric plating liquid and other liquids and adjusting the temperature of these liquids. Such kind of heat exchanger has the disadvantage that each of metal sheets must be welded to another metal sheet whenever the former is disposed on the latter and each passage thus formed must be subjected to a leak test during assembling thereof, and as a result, it is very troublesome to fabricate the heat exchanger and hence the fabrication thereof could not be effected in a mass production scale.

An object of the invention is to provide a heat ex changer comprising a plurality of composite cylindrical shells each of which is composed of a pair of trough shaped elements each of which is welded into one integral body and subjected to a leak test and then assembled into the heat exchanger with a minimum of time and labor.

Another object of the invention is to provide a heat exchanger having an excellent anti-corrosive property and thermal efficiency.

A feature of the invention is the provision of such an improved heat exchanger comprising a plurality of composite cylindrical shells concentrically arranged and spaced apart one from the other, each composite cylindrical shell being composed of a pair of trough shaped elements each of which consists of two segments made integral into one body and one of these segments has a number of longitudinal ribs spaced apart one from the other and extending in a lengthwise direction throughout the total length of the segment, and another segment has a number of peripheral ribs spaced apart one from the other and extending in a peripheral direction throughout the total periphery of the segment, the latter segment surrounding the former segment to form a number of first elongate passages extending throughout the total length of the segments and said composite cylindrical shells being closed at their substantially upper and lower portions by blanking plates to form a plurality of second elongate passages extending throughout substantially total lengths of the composite cylindrical shells in parallel with said first passages, a pair of openings provided at the top and base of said composite cylindrical shells and communicated with said first passages for introducing and discharging hot or cold medium, and another pair of openings provided at substantially upper and lower diametrically opposite side portions of said composite cylindrical shells and communicated with said second passages for introducing and discharging fluid to be heated or cooled.

Other objects, features and advantages of the invention will become apparent from a consideration from the following specification, when the specification in conjunction with the accompanying drawings, which illustrates in:

FIG. 1 is a front elevation showing one embodiment of the heat exchanger according to the invention;

FIG. 2 is its side view;

FIG. 3 is a sectional view taken along the line Ill-III of FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV of FIG. 1;

FIG. 5 is a sectional view taken along the line V-V of FlG. 1;

FIG. 6 is a perspective view showing a trough shaped element consisting of two trough shaped segments;

FIG. 7 is a front elevation showing the heat exchanger shown in FIG. 1 in its assembled state; and

FIG. 8 is its side view.

Referring to FIGS. 1 and 2, reference numeral 1 designates one embodiment of the heat exchanger accord ing to the invention which is provided at its top with an inlet opening 2 for introducing hot or cold medium. 3 shows an outlet opening provided at the base of the heat exchanger and for discharging the hot or cold medium. The heat exchanger 1 is provided at its substantially lower side portion with another inlet opening 4 for introducing fluid to be heated or cooled. The fluid to be heated or cooled is adapted to be discharged from another outlet opening 5 provided substantially upper opposite side portion of the heat exchanger 1. First elongate passages extend from the inlet opening 2 to the outlet opening 3. 6 designates blanking plates provided at substantially upper and lower portions of the heat exchanger 1 and for closing the interior of the heat exchanger 1 except the first elongate passages to form second elongate passages extending from the inlet opening 4 to the outlet opening 5. 7 shows spacers to be described later.

The heat exchanger according to the invention comprises a plurality of composite cylindrical shells 8 concentrically arranged and spaced apart one from the other and welded together at their diametrically opposite sides by the spacers 7 as shown in FIGS. 3 to 5.

Each composite cylindrical shell 8 is composed of a pair of trough shaped elements 9. As shown in FIG. 6, each trough shaped element 9 consists of two segments 10 and 11 made integral into one body with flanges 12 and 13 thereof welded together. The segment 10 has a number of longitudinal ribs 14 spaced apart one from the other and extending in a lengthwise direction throughout the total length of the segment 10. Another segment 11 has a number of peripheral ribs 15 spaced apart one from the other and extending in a peripheral direction throughout the total periphery of the segment 11.

The segment 10 is surrounded by the segment 11 to form a number of first elongate passages 16 extending throughout the total length of the segments 10 and 11.

. substrate 19 as shown in FIGS. 7 and 8 in which referduced into the inlet opening 2 and flows downwardly through the first passages 16 and then flows out of the outlet opening 3.

The fluid to be heated or cooled is introduced into the inlet opening 4 and flows upwardly through the sec ond passages 17 and then flows out of the outlet opening 5.

In the embodiment of the invention shown in the drawings, the heat exchanger according to the invention is constructed by assembling three composite cylindrical shells 8. It is tobe understood, however, that use may be made of at least two composite cylindrical shells 8 such as two, three,'four, five, etc.

The trough shaped elements 9, spacers 7 and blanking plate 6 may preferably be made of anti-corrosive metal sheet such, for example, as stainless steel, titanium, zirconium and tantalum.

The heat exchanger according to the invention can be assembled by starting from each trough shaped element 9 and by welding the flanges l2, 13 of the two segments 10, 11 to the spacers 7. As a result, the leak test, etc., can be effected on each trough shaped element 9 before assembling these elements into a plurality of composite cylindrical shells 8.

In addition, the heat exchanger according to the invention comprises at least two composite cylindrical shells 8, 8, each composite cylindrical shell 8 being composed of a pair of trough shaped elements 9 and each of which consists of two segments l0, 11 one of which has a number of longitudinal ribs 14 and another segment 11 has a plurality of peripheral ribs 15, each of these ribs l4, 15 being spaced apart by a given space and alternated with each other. Thus, the heat exchanger according to the invention is significantly stronger and simpler in construction and provides a wider heat exchanging surface if compared with the conventional heat exchanger. In addition, the heat exchanger according to the invention is capable of effecting the leak test on every trough shaped element 9 and then assembling the trough shaped elements 9 thus tested into one integral body and then into a plurality of composite shells 8 forming the heat exchanger, and this eliminates a troublesome operation which has been encounted with the conventional heat exchanger assembled by disposing one metal sheet on another metal sheet and welding these metal sheets at their side edges and then effecting the leak test during the assembling. Thus, the heat exchanger according to the invention can be manufactured in a very simple manner and mass production scale.

What is claimed is:

1. A heat exchanger comprising a plurality of composite cylindrical shells concentrically arranged and spaced apart one from the other and welded together by means of spacers, each composite cylindrical shell being composed of a pair of trough shaped elements each of which consists of two segments made integral into one body and one of these segments has a number of longitudinal ribs spaced apart one from the other and extending in a lengthwise direction throughout the total length of the segment, and another segment has a number of peripheral ribs spaced apart one from the other and extending in a peripheral direction throughout total periphery of the segment, the latter segment surrounding the former segment to form a number of first elongate passages extending throughout the total length of the segments, said composite cylindrical shells being closed at their substantially upper and lower portions by blanking plates to form a plurality of second elongate passages extending throughout substantially total length of the composite cylindrical shells in parallel with said first passages, a pair of openings provided at the top and base of said composite cylindrical shells and communicated with said first passages for introducing and discharging hot or cold medium, and another pair of openings provided at substantially upper and lower diametrically opposite side portions of said composite cylindrical shells and communicated with said second passages for introducing and discharging fluid to be heated or cooled. 

1. A heat exchanger comprising a plurality of composite cylindrical shells concentrically arranged and spaced apart one from the other and welded together by means of spacers, each composite cylindrical shell being composed of a pair of trough shaped elements each of which consists of two segments made integral into one body and one of these segments has a number of longitudinal ribs spaced apart one from the other and extending in a lengthwise direction throughout the total length of the segment, and another segment has a number of peripheral ribs spaced apart one from the other and extending in a peripheral direction throughout total periphery of the segment, the latter segment surrounding the former segment to form a number of first elongate passages extending throughout the total length of the segments, said composite cylindrical shells being closed at their substantially upper and lower portions by blanking plates to form a plurality of second elongate passages extending throughout substantially total length of the composite cylindrical shells in parallel with said first passages, a pair of openings provided at the top and base of said composite cylindrical shells and communicated with said first passages for introducing and discharging hot or cold medium, and another pair of openings provided at substantially upper and loweR diametrically opposite side portions of said composite cylindrical shells and communicated with said second passages for introducing and discharging fluid to be heated or cooled. 